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ONS coding system
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The Office for National Statistics coding system is a hierarchical code used in the United Kingdom for tabulating census and other statistical data.
code is constructed top down from a 4 character code representing a unitary authority or administrative county & district, eg:
Local Government wards have a two-letter code within their local authority, and Census Output Areas an additional 4 digits within a ward.

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Encyclopedia
The Office for National Statistics coding system is a hierarchical code used in the United Kingdom for tabulating census and other statistical data.
Authorities, wards, and census areas
The code is constructed top down from a 4 character code representing a unitary authority or administrative county & district, eg:
Local Government wards have a two-letter code within their local authority, and Census Output Areas an additional 4 digits within a ward. Census Output Areas (OAs) are the smallest unit for which census data is published - they contain at least 40 households (preferably 100), and are built up from postcode blocks after the census data is available, with a view to being socially as homogeneous as possible. A new set of Output Areas will be created for each decennial census. Census 2001 was the first to use this system - previously census data was published for larger Enumeration Districts which were delineated before the census was conducted. Enumeration Districts are still used for the collection of data but not for publication.
The authority and ward codes are recognised by Eurostat as Local administrative unit code levels 1 & 2 within the NUTS system.
Civil parishes
An overlapping system encodes Civil Parish areas. Parishes are represented by an additional 3 digits within their local authority:
Super Output Areas
Super Output Areas (SOAs) are a set of geographies developed after the 2001 census. The aim was to produce a set of areas of consistent size, whose boundaries would not change (unlike electoral wards). They are an aggregation of adjacent Output Areas with similar social characteristics. Lower Layer SOAs typically contain 4 to 6 OAs with a population of around 1500. Middle Layer SOAs on average have a population of 7,200. Upper Layer SOAs are still being calculated; they are expected to cover a population of at least 25,000 each.
ONS codes for counties & districts
Also showing NUTS(3) codes thus: (UKH12)
Single-tier districts
Two-tier counties & districts
01-07 obsolete, were Greater London & the metropolitan counties
08 obsolete, was Avon
*08UB obsolete, was Bath
*08UC obsolete, was Bristol
*08UD obsolete, was Kingswood
*08UE obsolete, was Northavon
*08UF obsolete, was Wansdyke
*08UG obsolete, was Woodspring
09 (UKH22) Bedfordshire
*09UB obsolete, was Luton
*09UC Mid Bedfordshire
*09UD Bedford
*09UE South Bedfordshire
10 obsolete, was Berkshire
*10UB obsolete, was Bracknell Forest
*10UC obsolete, was Newbury
*10UD obsolete, was Reading
*10UE obsolete, was Slough
*10UF obsolete, was Windsor and Maidenhead
*10UG obsolete, was Wokingham
11 (UKJ13) Buckinghamshire
*11UB Aylesbury Vale
*11UC Chiltern
*11UD obsolete, was Milton Keynes
*11UE South Bucks
*11UF Wycombe
12 (UKH12) Cambridgeshire
*12UB Cambridge
*12UC East Cambridgeshire
*12UD Fenland
*12UE Huntingdonshire
*12UF obsolete, was Peterborough
*12UG South Cambridgeshire
13 (UKD22) Cheshire
*13UB Chester
*13UC Congleton
*13UD Crewe and Nantwich
*13UE Ellesmere Port and Neston
*13UF obsolete, was Halton
*13UG Macclesfield
*13UH Vale Royal
*13UJ obsolete, was Warrington
14 obsolete, was Cleveland
*14UB obsolete, was Hartlepool
*14UC obsolete, was Langbaurgh-on-Tees
*14UD obsolete, was Middlesbrough
*14UE obsolete, was Stockton-on-Tees
15 (UKK30) Cornwall and Scilly
*15UB Caradon
*15UC Carrick
*15UD Kerrier
*15UE North Cornwall
*15UF Penwith
*15UG Restormel
*15UH Isles of Scilly
16 Cumbria
*16UB (UKD11) Allerdale
*16UC (UKD11) Barrow-in-Furness
*16UD (UKD12) Carlisle
*16UE (UKD11) Copeland
*16UF (UKD12) Eden
*16UG (UKD12) South Lakeland
17 Derbyshire
*17UB (UKF13) Amber Valley
*17UC (UKF12) Bolsover
*17UD (UKF12) Chesterfield
*17UE obsolete, was Derby
*17UF (UKF13) Derbyshire Dales
*17UG (UKF13) Erewash
*17UH (UKF13) High Peak
*17UJ (UKF12) North East Derbyshire
*17UK (UKF13) South Derbyshire
18 (UKK43) Devon
*18UB East Devon
*18UC Exeter
*18UD Mid Devon
*18UE North Devon
*19UF obsolete, was Plymouth
*18UG South Hams
*18UH Teignbridge
*19UJ obsolete, was Torbay
*18UK Torridge
*18UL West Devon
19 (UKK22) Dorset
*19UB obsolete, was Bournemouth
*19UC Christchurch
*19UD East Dorset
*19UE North Dorset
*19UF obsolete, was Poole
*19UG Purbeck
*19UH West Dorset
*19UJ Weymouth and Portland
20 (UKC14) County Durham
*20UB Chester-le-Street
*20UC obsolete, was Darlington
*20UD Derwentside
*20UE Durham
*20UF Easington
*20UG Sedgefield
*20UH Teesdale
*20UJ Wear Valley
21 (UKJ22) East Sussex
*21UB obsolete, was Brighton
*21UC Eastbourne
*21UD Hastings
*21UE obsolete, was Hove
*21UF Lewes
*21UG Rother
*21UH Wealden
22 (UKH33) Essex
*22UB Basildon
*22UC Braintree
*22UD Brentwood
*22UE Castle Point
*22UF Chelmsford
*22UG Colchester
*22UH Epping Forest
*22UJ Harlow
*22UK Maldon
*22UL Rochford
*22UM obsolete, was Southend-on-Sea
*22UN Tendring
*22UP obsolete, was Thurrock
*22UQ Uttlesford
23 (UKK13) Gloucestershire
*23UB Cheltenham
*23UC Cotswold
*23UD Forest of Dean
*23UE Gloucester
*23UF Stroud
*23UG Tewkesbury
24 (UKJ33) Hampshire
*24UB Basingstoke and Deane
*24UC East Hampshire
*24UD Eastleigh
*24UE Fareham
*24UF Gosport
*24UG Hart
*24UH Havant
*24UJ New Forest
*24UK obsolete, was Portsmouth
*24UL Rushmoor
*24UM obsolete, was Southampton
*24UN Test Valley
*24UP Winchester
25 obsolete, was Hereford and Worcester
*25UB obsolete, was Bromsgrove
*25UC obsolete, was Hereford
*25UD obsolete, was Leominster
*25UE obsolete, was Malvern Hills
*25UF obsolete, was Redditch
*25UG obsolete, was South Herefordshire
*25UH obsolete, was Worcester
*25UJ obsolete, was Wyre Forest
*25UK obsolete, was Wychavon
26 (UKH23) Hertfordshire
*26UB Broxbourne
*26UC Dacorum
*26UD East Hertfordshire
*26UE Hertsmere
*26UF North Hertfordshire
*26UG St Albans
*26UH Stevenage
*26UJ Three Rivers
*26UK Watford
*26UL Welwyn Hatfield
27 obsolete, was Humberside
*27UB obsolete, was Boothferry
*27UC obsolete, was Cleethorpes
*27UD obsolete, was East Yorkshire
*27UE obsolete, was Beverley
*27UF obsolete, was Glanford
*27UG obsolete, was Holderness
*27UH obsolete, was Great Grimsby
*27UJ obsolete, was Kingston upon Hull
*27UK obsolete, was Scunthorpe
28 obsolete, was Isle of Wight county
*29UB obsolete, was Medina
*29UB obsolete, was South Wight
29 (UKJ42) Kent
*29UB Ashford
*29UC Canterbury
*29UD Dartford
*29UE Dover
*29UF obsolete, was Gillingham
*29UG Gravesham
*29UH Maidstone
*29UJ obsolete, was Rochester upon Medway
*29UK Sevenoaks
*29UL Shepway
*29UM Swale
*29UN Thanet
*29UP Tonbridge and Malling
*29UQ Tunbridge Wells
30 (UKD43) Lancashire
*30UB obsolete, was Blackburn
*30UC obsolete, was Blackpool
*30UD Burnley
*30UE Chorley
*30UF Fylde
*30UG Hyndburn
*30UH Lancaster
*30UJ Pendle
*30UK Preston
*30UL Ribble Valley
*30UM Rossendale
*30UN South Ribble
*30UP West Lancashire
*30UQ Wyre
31 (UKF22) Leicestershire
*31UB Blaby
*31UC Charnwood
*31UD Harborough
*31UE Hinckley and Bosworth
*31UF obsolete, was Leicester
*31UG Melton
*31UH North West Leicestershire
*31UJ Oadby and Wigston
*31UK obsolete, was Rutland
32 (UKF30) Lincolnshire
*32UB Boston
*32UC East Lindsey
*32UD Lincoln
*32UE North Kesteven
*32UF South Holland
*32UG South Kesteven
*32UH West Lindsey
33 (UKH13) Norfolk
*33UB Breckland
*33UC Broadland
*33UD Great Yarmouth
*33UE King's Lynn and West Norfolk
*33UF North Norfolk
*33UG Norwich
*33UH South Norfolk
34 (UKF23) Northamptonshire
*34UB Corby
*34UC Daventry
*34UD East Northamptonshire
*34UE Kettering
*34UF Northampton
*34UG South Northamptonshire
*34UH Wellingborough
35 (UKC21) Northumberland
*35UB Alnwick
*35UC Berwick-upon-Tweed
*35UD Blyth Valley
*35UE Castle Morpeth
*35UF Tynedale
*35UG Wansbeck
36 (UKE22) North Yorkshire
*36UB Craven
*36UC Hambleton
*36UD Harrogate
*36UE Richmondshire
*36UF Ryedale
*36UG Scarborough
*36UH Selby
*36UJ obsolete, was York
37 Nottinghamshire
*37UB (UKF15) Ashfield
*37UC (UKF15) Bassetlaw
*37UD (UKF16) Broxtowe
*37UE (UKF16) Gedling
*37UF (UKF15) Mansfield
*37UG (UKF15) Newark and Sherwood
*37UH obsolete, was Nottingham
*37UJ (UKF16) Rushcliffe
38 (UKJ14) Oxfordshire
*38UB Cherwell
*38UC Oxford
*38UD South Oxfordshire
*38UE Vale of White Horse
*38UF West Oxfordshire
39 (UKG22) Shropshire
*39UB Bridgnorth
*39UC North Shropshire
*39UD Oswestry
*39UE Shrewsbury and Atcham
*39UF South Shropshire
*39UG obsolete, was The Wrekin
40 (UKK23) Somerset
*40UB Mendip
*40UC Sedgemoor
*40UD South Somerset
*40UE Taunton Deane
*40UF West Somerset
41 (UKG24) Staffordshire
*41UB Cannock Chase
*41UC East Staffordshire
*41UD Lichfield
*41UE Newcastle-under-Lyme
*41UF South Staffordshire
*41UG Stafford
*41UH Staffordshire Moorlands
*41UJ obsolete, was Stoke-on-Trent
*41UK Tamworth
42 (UKH14) Suffolk
*42UB Babergh
*42UC Forest Heath
*42UD Ipswich
*42UE Mid Suffolk
*42UF St. Edmundsbury
*42UG Suffolk Coastal
*42UH Waveney
43 (UKJ23) Surrey
*43UB Elmbridge
*43UC Epsom and Ewell
*43UD Guildford
*43UE Mole Valley
*43UF Reigate and Banstead
*43UG Runnymede
*43UH Spelthorne
*43UJ Surrey Heath
*43UK Tandridge
*43UL Waverley
*43UM Woking
44 (UKG13) Warwickshire
*44UB North Warwickshire
*44UC Nuneaton and Bedworth
*44UD Rugby
*44UE Stratford-on-Avon
*44UF Warwick
45 (UKJ24) West Sussex
*45UB Adur
*45UC Arun
*45UD Chichester
*45UE Crawley
*45UF Horsham
*45UG Mid Sussex
*45UH Worthing
46 (UKK15) Wiltshire
*46UB Kennet
*46UC North Wiltshire
*46UD Salisbury
*46UE obsolete, was Thamesdown
*46UF West Wiltshire
47 (UKG12) Worcestershire
*47UB Bromsgrove
*47UC Malvern Hills
*47UD Redditch
*47UE Worcester
*47UF Wychavon
*47UG Wyre Forest
Northern Ireland districts
95A (UKN04) Derry
95B (UKN04) Limavady
95C (UKN04) Coleraine
95D (UKN04) Ballymoney
95E (UKN04) Moyle
95F (UKN03) Larne
95G (UKN03) Ballymena
95H (UKN05) Magherafelt
95I (UKN05) Cookstown
95J (UKN04) Strabane
95K (UKN05) Omagh
95L (UKN05) Fermanagh
95M (UKN05) Dungannon and South Tyrone
95N (UKN03) Craigavon
95O (UKN05) Armagh
95P (UKN05) Newry and Mourne
95Q (UKN03) Banbridge
95R (UKN03) Down
95S (UKN02) Lisburn
95T (UKN03) Antrim
95U (UKN02) Newtownabbey
95V (UKN02) Carrickfergus
95W (UKN02) North Down
95X (UKN03) Ards
95Y (UKN02) Castlereagh
95Z (UKN01) Belfast
Non-hierarchical codes for summary data in metropolitan areas
1B Inner London
1C Outer London
2A Greater Manchester
2B Merseyside
2C South Yorkshire
2D Tyne and Wear
2E West Midlands
2F West Yorkshire
2009 structural changes The following changes will be made on 1st April 2009 to reflect the 2009 structural changes to local government in England.
External links
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